This taxon is Not Recognised as a species by BirdLife International.
Picoides tridactylus and P. funebris (del Hoyo and Collar 2014) were previously lumped as P. tridactylus following AOU (2003). P. tridactylus (del Hoyo and Collar 2014) was previously split into P. tridactylus and P. dorsalis following AOU (2003), and prior to that all three taxa were lumped as P. tridactylus following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Picoides tridactylus. Downloaded from http://www.birdlife.org on 06/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 06/12/2016.